4221539 has 4 divisors (see below), whose sum is σ = 4824624. Its totient is φ = 3618456.

The previous prime is 4221533. The next prime is 4221541. The reversal of 4221539 is 9351224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4221539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4221533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301532 + ... + 301545.

It is an arithmetic number, because the mean of its divisors is an integer number (1206156).

Almost surely, 2^4221539 is an apocalyptic number.

4221539 is a deficient number, since it is larger than the sum of its proper divisors (603085).

4221539 is an equidigital number, since it uses as much as digits as its factorization.

4221539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603084.

The product of its digits is 2160, while the sum is 26.

The square root of 4221539 is about 2054.6384110106. The cubic root of 4221539 is about 161.6182011285.

The spelling of 4221539 in words is "four million, two hundred twenty-one thousand, five hundred thirty-nine".